Re: ACPI Battery status on Acer TravelMate a-550XV

Hi Robert,

On Fri, Nov 15, 2002 at 10:45:38AM -0800, Moore, Robert wrote:

quoted

From looking at your disassembled dsdt, I think that there is a problem with

the _BIF method:

                    Method (_BIF, 0, NotSerialized)
                    {
                        Name (STAT, Package (0x0D)
                        {
                            0x01, 
                            0x1194, 
                            0x1194, 
                            0x01, 
                            0x39D0, 
                            0x01A4, 
                            0x9C, 
                            0x0108, 
                            0x0EC4, 
                            "PXBAS008", 
                            "3658Q", 
                            "NiMH ", 
                            Zero, 
                            "PANASONIC"
                        })
                        ...

                            Sleep (0x64)
                        ...

                        Return (STAT)
                    }

1) The sleep within the method will allow another thread to begin execution
of the same method -- because the method is declared "NotSerialized"

2) The declaration of the "STAT" package in the namespace will fail with
AE_ALREADY_EXISTS if a second thread reenters the method (exactly the
problem you are seeing when you pop the battery back in.)

My suggested fix:
Disassemble the dsdt (iasl -d dsdt.dat)
Change "NotSerialized" to "Serialized" in the declaration of _BIF.
Recompile and install the new dsdt (Override the BIOS dsdt)

Just for your info.  You should look at 
http://marc.theaimsgroup.com/?l=acpi4linux&m=101586220402069&w=2

with also this s/must be declared/should be declared/
BTW, I think that it is more likely an ACPI spec issue, and it should be
clarified in other release of the spec.


-- 
Ducrot Bruno
http://www.poupinou.org        Page profaissionelle
http://toto.tu-me-saoules.com  Haume page


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